/Engine/Source/Editor/UnrealEd/Public/FbxImporter.h
This function show a dialog to let the user know what will be change in the skeleton if the fbx is imported
static void ShowFbxSkeletonConflictWindow ( [USkeletalMesh](API\Runtime\Engine\Engine\USkeletalMesh) * SkeletalMesh, [USkeleton](API\Runtime\Engine\Animation\USkeleton) * Skeleton, [ImportCompareHelper::FSkeletonCompareData](API\Editor\UnrealEd\Factories\FSkeletonCompareData) & SkeletonCompareData )